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      <h1><a href="./index.html">docs</a> &raquo; MiddleClickDragScroll</h1>
      <p>Allows scrolling by holding down the middle mouse button and dragging it, the same as it works on Windows.
Especially useful to quickly scroll to the top or bottom of a page, if you don't have a Magic Mouse.</p>
<p>Note: Due to OS limitations, it always scrolls the window currently below the mouse, not the window below the position
where the dragging started, like it works on Windows. You therefore need to take some care to stay inside the window.</p>
<p>== Usage ==</p>
<div class="highlight"><pre><span></span><span class="kd">local</span> <span class="n">MiddleClickDragScroll</span> <span class="o">=</span> <span class="n">hs</span><span class="p">.</span><span class="n">loadSpoon</span><span class="p">(</span><span class="s2">&quot;MiddleClickDragScroll&quot;</span><span class="p">):</span><span class="n">start</span><span class="p">()</span>
</pre></div>
<p>You can temporarily stop the spoon by calling <code>MiddleClickDragScroll:stop()</code> and then restart it by calling <code>MiddleClickDragScroll:start()</code> again.</p>
<p>== Configuration ==</p>
<div class="highlight"><pre><span></span><span class="kd">local</span> <span class="n">MiddleClickDragScroll</span> <span class="o">=</span> <span class="n">hs</span><span class="p">.</span><span class="n">loadSpoon</span><span class="p">(</span><span class="s2">&quot;MiddleClickDragScroll&quot;</span><span class="p">):</span><span class="n">configure</span><span class="p">{</span>
  <span class="n">excludedApps</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;Some App&quot;</span><span class="p">,</span> <span class="s2">&quot;Other app&quot;</span><span class="p">},</span>         <span class="c1">-- Don&#39;t activate scrolling in apps with these names</span>
  <span class="n">excludedWindows</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;^Some Window Title$&quot;</span><span class="p">},</span>        <span class="c1">-- Don&#39;t activate scrolling in windows with these names (supports regex, for exact match, use &quot;^title$&quot;)</span>
  <span class="n">excludedUrls</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;^https://geogebra.calculator$&quot;</span><span class="p">},</span> <span class="c1">-- Don&#39;t activate scrolling when the active window is on these URLs (supports regex, only works in Chrome and Safari, asks for extra permissions on first trigger)</span>
  <span class="n">indicatorSize</span> <span class="o">=</span> <span class="mi">25</span><span class="p">,</span>   <span class="c1">-- Size of the scrolling indicator in pixels</span>
  <span class="n">indicatorAttributes</span> <span class="o">=</span> <span class="c1">-- Attributes of the scrolling indicator. Takes any specified on https://www.hammerspoon.org/docs/hs.canvas.html#attributes. Alternatively, you can pass a custom canvas, see the explenation below.</span>
  <span class="p">{</span>
    <span class="nb">type</span> <span class="o">=</span> <span class="s2">&quot;circle&quot;</span><span class="p">,</span>
    <span class="n">fillColor</span> <span class="o">=</span> <span class="p">{</span> <span class="n">red</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">green</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">blue</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">alpha</span> <span class="o">=</span> <span class="mf">0.3</span> <span class="p">},</span>
    <span class="n">strokeColor</span> <span class="o">=</span> <span class="p">{</span> <span class="n">red</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">green</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">blue</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">alpha</span> <span class="o">=</span> <span class="mf">0.5</span> <span class="p">},</span>
  <span class="p">},</span>
  <span class="n">startDistance</span> <span class="o">=</span> <span class="mi">15</span><span class="p">,</span>       <span class="c1">-- Minimal distance to drag the mouse before scrolling is triggered.</span>
  <span class="n">scrollMode</span> <span class="o">=</span> <span class="s2">&quot;pixel&quot;</span><span class="p">,</span>     <span class="c1">-- Whether the scroll speed is in &quot;line&quot;s or &quot;pixel&quot;s. Scrolling by lines has smooting in some applications</span>
                            <span class="c1">-- and therefore works with reduced frequency but it offers much less precise control.</span>
  <span class="n">scrollFrequency</span> <span class="o">=</span> <span class="mf">0.01</span><span class="p">,</span>   <span class="c1">-- How often to trigger scrolling (in seconds)</span>
  <span class="n">scrollAccelaration</span> <span class="o">=</span> <span class="mi">30</span><span class="p">,</span>  <span class="c1">-- How fast scrolling accelerates based on the mouse distance from the initial location. Larger is faster.</span>
  <span class="n">scrollSpeedFn</span> <span class="o">=</span>           <span class="c1">-- How scrolling accelerates based on the mouse distance from the initial location.</span>
                            <span class="c1">-- The default is dist^2 / scrollAcceleration^2. You can pass a custom function that recieves `self` as the first argument</span>
                            <span class="c1">-- and the absolute distance as the second and returns the resulting speed (in pixels or lines, depending on the scrollMode setting).</span>
  <span class="kr">function</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
    <span class="kr">return</span> <span class="p">(</span><span class="n">x</span> <span class="o">^</span> <span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="p">(</span><span class="n">self</span><span class="p">.</span><span class="n">scrollAccelaration</span> <span class="o">^</span> <span class="mi">2</span><span class="p">)</span>
  <span class="kr">end</span>
<span class="p">}:</span><span class="n">start</span><span class="p">()</span>
</pre></div>
<p>Unspecified keys are unchanged. You can call <code>configure</code> multiple times to dynamically change it but changing <code>indicatorAttributes</code> and <code>indicatorSize</code> only works when <code>MiddleClickDragScroll</code> is stopped.</p>
<p>Instead of <code>indicatorSize</code> and <code>indicatorAttributes</code>, you can also pass a custom canvas to <code>configure</code> or set it directly to have more control over the indicator style:</p>
<div class="highlight"><pre><span></span><span class="n">MiddleClickDragScroll</span><span class="p">.</span><span class="n">canvas</span> <span class="o">=</span> <span class="n">hs</span><span class="p">.</span><span class="n">canvas</span><span class="p">.</span><span class="n">new</span><span class="p">{</span> <span class="n">w</span> <span class="o">=</span> <span class="mi">25</span><span class="p">,</span> <span class="n">h</span> <span class="o">=</span> <span class="mi">25</span><span class="p">}:</span><span class="n">insertElement</span><span class="p">{</span>
    <span class="nb">type</span> <span class="o">=</span> <span class="s2">&quot;circle&quot;</span><span class="p">,</span>
    <span class="n">fillColor</span> <span class="o">=</span> <span class="p">{</span> <span class="n">red</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">green</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">blue</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">alpha</span> <span class="o">=</span> <span class="mf">0.3</span> <span class="p">},</span>
    <span class="n">strokeColor</span> <span class="o">=</span> <span class="p">{</span> <span class="n">red</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">green</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">blue</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">alpha</span> <span class="o">=</span> <span class="mf">0.5</span> <span class="p">},</span>
  <span class="p">}</span>
</pre></div>
<p>For more details, see: https://www.hammerspoon.org/docs/hs.canvas.html</p>
<p>Download: <a href="https://github.com/Hammerspoon/Spoons/raw/master/Spoons/MiddleClickDragScroll.spoon.zip">https://github.com/Hammerspoon/Spoons/raw/master/Spoons/MiddleClickDragScroll.spoon.zip</a></p>

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      <h3>API Documentation</h3>
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